CN218956040U - Paper container leakage detection device - Google Patents

Abstract

The utility model discloses a paper container leakage detection device, which belongs to the technical field of leakage detection equipment and comprises an upper cylinder, wherein a low-pressure air inlet piece is connected below the upper cylinder, a cup mold is arranged below the low-pressure air inlet piece in a matched mode, a bottom sealing piece is arranged in the cup mold, a paper container is arranged in the cup mold, a lower cylinder is fixedly arranged at the bottom of the cup mold, the lower cylinder comprises a lower piston rod connected with the bottom sealing piece, an air inlet joint is connected to the low-pressure air inlet piece, a first air pipe joint is connected to the cup mold, and a second air pipe joint is connected to the lower piston rod. The utility model judges whether the paper container leaks or not by introducing and maintaining low-pressure gas into the paper container and then detecting the pressure change of the gas pressure at the bottom and the outer side of the cup wall.

Description

Paper container leakage detection device

Technical Field

The utility model belongs to the technical field of leakage detection equipment, and particularly relates to a paper container leakage detection device.

Background

The disposable paper cup is convenient to carry and use, is low in cost, is a common drinking tool in many public places, is usually subjected to industrial processing in the prior art, and has the advantages of high efficiency and rapidness. However, at present, manual sampling inspection or watertight inspection is mostly adopted in the paper cup production quality inspection process, uncertainty exists in the manual sampling inspection, the quality can be controlled approximately only through probability statistics, and each paper cup cannot be ensured to be a qualified product.

The existing leakage detection machine for paper cups generally adopts fresh water to perform leakage detection operation, loss or pouring is carried out after detection is carried out once, and the recycling and circulating device of the fresh water is generally lacked, so that the detection cost is increased and the water resource is wasted, and the PE film is subjected to unilateral water spraying, so that the cup wall on the side is damaged more easily, and unnecessary loss is caused.

The utility model discloses a paper cup water leakage detector with the application number of JP2003276713A, which comprises a leakage detection unit, wherein the leakage detection unit comprises a storage container for detecting paper cups, which is circumferentially distributed, a rotary table is arranged above the leakage detection unit, and a paper cup supply device and a paper cup discharge pipe are arranged on the rotary table, so that the paper cup water leakage detector can continuously detect leakage of paper cups, but the device has a large improvement space in any of the following technical problems: the lid that holds the paper cup is mechanical to open and close, does not set up airtight part, leaks gas after closing easily, leads to the testing result inaccurate and eliminates the qualified product of this should detect, causes wasting of resources and cost to increase.

Disclosure of Invention

The utility model aims to provide a paper container leakage detection device which can carry out multi-azimuth, low-cost and lossless leakage detection on a paper container.

The technical scheme adopted by the utility model for achieving the purpose is as follows:

a paper container leak detection apparatus comprising: the lower part of the upper cylinder is connected with a guide fixing plate, a linear guide shaft and a low-pressure air inlet piece are respectively fixed above and below the guide fixing plate, a cup die is arranged below the low-pressure air inlet piece in a matched mode, a cup die base is fixed at the bottom of the cup die, a bottom sealing piece is arranged in the cup die in a sliding mode, a cylinder fixing plate is fixed at the bottom of the cup die base, a lower cylinder is fixed below the cylinder fixing plate, the lower cylinder is connected with the bottom sealing piece, a paper container is arranged in the cup die, the guide fixing plate is connected with a position sensing bolt, the low-pressure air inlet piece is connected with an air inlet joint, a first air pipe joint is connected to the side of the cup die, a second air pipe joint is connected to the lower part of the bottom of the lower cylinder, and the first air pipe joint and the second air pipe joint are both connected with a pressure sensor. The operation of the upper cylinder enables the low-pressure air inlet piece to move downwards, the height position of the low-pressure air inlet piece is detected by the position sensing bolt during the downward movement, so that the lifting amplitude is controlled, a plurality of airtight cavities which are not communicated with each other are formed among the cup die, the low-pressure air inlet piece, the bottom sealing piece and the cup die, the low-pressure air inlet piece inputs low pressure into the airtight cavity of the cup die through the air inlet joint and keeps the low-pressure air inlet piece, the pressure sensors connected with the first air pipe joint and the second air pipe joint detect air pressure of the cavities except the cavity, whether leakage exists in the paper container is judged by comparing the detected value with a preset value, the leak detection integrity of the paper container is guaranteed by the mode of detecting the air pressure at a plurality of positions, the quality of unqualified products is effectively and accurately removed, the quality of the factory products is guaranteed, the linear guide shaft is used for assisting in positioning the sliding of the upper cylinder, the lifting verticality of the upper cylinder is reduced, the tightness of the paper container during the downward pressing is affected by excessive shaking, and the leak detection result accuracy is affected.

Preferably, the upper cylinder is connected to a first throttle valve at an upper end side, and the lower cylinder is connected to a second throttle valve at each of the upper end side and the lower end side. The first throttle valve and the second throttle valve can regulate and control the sliding speed of the upper cylinder and the lower cylinder respectively, so that the paper container is properly compressed, damage to the qualified finished product caused by compression deformation of the paper container due to too high sliding speed is avoided, unnecessary loss caused by the leakage detection process is reduced, and damage to the upper cylinder and the lower cylinder due to too high sliding speed is avoided.

Preferably, the upper cylinder is connected with a pilot-operated one-way speed control valve at the side of the lower end. The pilot type unidirectional speed control valve is kept through throttling and shrinking of exhaust of the upper cylinder, so that the upper cylinder is guaranteed not to be lost due to gravity or external interference when not working, low-pressure air inlet pieces and the cup mold are damaged by impact, on one hand, part damage caused by accidents is reduced, meanwhile, workers can be prevented from being accidentally clamped, and safety of workers is guaranteed.

Preferably, the lower cylinder comprises a lower piston rod, the lower piston rod is hollow, a cup bottom sealing gasket is fixed above the bottom sealing piece, a bottom sealing plate is fixed above the cup mold base, the cup bottom sealing gasket and the bottom sealing piece are connected together, a second bolt pad is arranged in the second bolt pad in a matched mode, a second through hole bolt is arranged in the second bolt pad in a matched mode, the tail end below the second through hole bolt is located in the bottom sealing piece, and the lower piston rod penetrates through the cylinder fixing plate and the bottom sealing plate, and the top end of the lower piston rod is connected with the second through hole bolt in a matched mode. The paper container is placed in the cup mould and then is compressed tightly by the low-pressure air inlet piece, the lower piston rod is controlled to slide in the lower cylinder and lift, the lower piston rod drives the bottom sealing piece and the cup bottom sealing pad to move upwards simultaneously, and the lower piston rod is propped against the bottom of the paper container to form a sealing cavity, the bottom sealing piece capable of moving up and down is favorable for adapting to the paper container with different height sizes on one hand, the whole applicability of the device is improved, on the other hand, the paper container is prevented from being put into and then directly contacted with the bottom sealing piece, deformation is caused when the low-pressure air inlet piece presses down the paper container, the paper container is scrapped, economic loss is increased, the piston rod is communicated with the bottom sealing cavity through a second through hole bolt, and the pressure sensor connected with a second air pipe connector at the bottom is used for detecting the pressure of the bottom cavity, so that the leakage detection of the bottom surface of the paper container is realized.

Preferably, the upper cylinder comprises an upper piston rod, and a floating joint is connected between the upper piston rod and the guide fixing plate. The floating joint can enable the upper piston rod to slide smoothly in the upper cylinder in the axial direction and drive the guide fixing plate at the bottom and the low-pressure air inlet piece to lift, so that on one hand, the upper cylinder and the linear guide shaft are kept in parallel all the time, movement interference is avoided, on the other hand, the low-pressure air inlet piece is beneficial to vertically downwards pressing the upper end of the paper container, deformation caused by uneven pressing of the paper container due to shaking and inclination is avoided, and the rejection rate is reduced.

Preferably, the bottom of the low-pressure air inlet piece is fixedly provided with an outer sealing cover, an inner sealing cover is fixed on the inner side of the outer sealing cover, a sealing cover gasket is arranged between the outer sealing cover and the inner sealing cover, a first bolt pad is arranged in the outer sealing cover, a first through hole bolt is arranged in the first bolt pad in a matched mode, an air chamber is arranged in the low-pressure air inlet piece, and the first through hole bolt penetrates through the outer sealing cover and the inner sealing cover to be communicated with the air chamber and the air inlet joint. The low-pressure air inlet piece is matched and clamped with the upper end face of the cup die through the outer sealing cover, and the inner sealing cover is tightly pressed with the paper container to form the sealing of the inner cavity of the paper container so as to realize the air pressure detection of the sealing cavity, the inner sealing cover is positioned at the inner side of the upper end of the paper container at the moment and is used for assisting in positioning the paper container, the problem that the paper container is accidentally inclined to cause single-side compression deformation during pressing is avoided, low-pressure air is introduced into the air inlet joint, and the low-pressure air enters the air chamber and enters the inner cavity of the paper container through the first through hole bolt and is maintained.

Preferably, the cup die base is fixed with a linear bearing at the axis, the inner ring of the linear bearing is matched with the lower piston rod, and the lower piston rod can axially slide relative to the linear bearing. The linear bearing limits the telescopic sliding of the lower piston rod, ensures that the lower piston rod drives the bottom sealing member and the cup bottom sealing gasket to slide in the axial direction of the cup mold, is favorable for forming a sealed space at the bottom of the paper container, avoids air leakage caused by the inclination of the bottom sealing member, and enables the qualified products to be misjudged to have air leakage.

Preferably, the paper container comprises a container side wall, a container bottom plate is fixed at the bottom of the container side wall, and a round lip is arranged at the outer edge of the upper end of the container side wall. After the inner sealing cover presses down the round lip, the bottom sealing piece moves upwards to be abutted against the bottom of the side wall of the container, at the moment, three sealing cavities which are not communicated with each other are formed, namely an inner cavity at the inner side of the side wall of the container, an outer cavity at the outer side of the side wall of the container and a bottom cavity formed below the bottom plate of the container, and whether air leakage is qualified is judged through low-pressure air detection of the outer cavity and the bottom cavity.

Preferably, the upper end surface of the cup die is provided with a ring groove downwards, the inner bottom surface of the ring groove is fixedly provided with a cup opening gasket, the upper surface of the cup opening gasket is fixedly provided with a cup opening circular ring, and the circular lip is matched with the cup opening circular ring. The rim gasket and the rim ring elastically support the bottom of the round lip so as to facilitate the formation of each sealing cavity after the external sealing cover is pressed down, and reduce the possibility of scrapping the round lip due to excessive deformation caused by pressing.

Preferably, a cylinder sealing ring is arranged between the cup die base and the bottom sealing plate and the lower piston rod in a matched mode. The sealing ring of the air cylinder ensures the tightness of the lower piston rod when sliding in the base of the cup die and the bottom sealing plate, avoids inaccurate detection and eliminates qualified products caused by leakage of the bottom cavity, and reduces loss.

The utility model adopts the telescopic sliding low-pressure air inlet piece and the bottom sealing piece to match with the cup die for multi-azimuth leak detection, thereby having the following beneficial effects: the low-pressure air inlet piece, the bottom sealing piece and the paper container are abutted to form a plurality of sealing cavities, and the paper container is subjected to multi-aspect leakage detection through the pressure sensor, so that the detection accuracy is improved; the linear guide shaft carries out sliding positioning on the upper cylinder, so that detection deviation caused by shaking is reduced; the pilot-operated unidirectional speed control valve realizes locking of the upper cylinder in a non-working state, and accidents and losses caused by accidental falling are avoided; the floating joint ensures the vertical lifting of the upper piston rod, improves the leak detection accuracy, and avoids misjudgment and increases the cost; the linear bearing ensures the sliding verticality of the lower piston rod, is favorable for forming a closed cavity and improves the leak detection accuracy. Therefore, the utility model is a paper container leakage detection device which can carry out multi-azimuth, low-cost and lossless leakage detection on the paper container.

Drawings

FIG. 1 is a schematic diagram of an upper cylinder in an inactive state;

FIG. 2 is a schematic diagram of the upper cylinder operating state;

FIG. 3 is a schematic view of a linear guide shaft;

FIG. 4 is a schematic view of an air intake fitting;

FIG. 5 is a schematic diagram of the upper cylinder in semi-section;

FIG. 6 is a schematic view in semi-section of a low pressure gas inlet;

FIG. 7 is a schematic view of the exterior of the cup mold;

FIG. 8 is a schematic view of a cup mold in semi-section;

FIG. 9 is a schematic view of a bottom seal in semi-section;

FIG. 10 is an enlarged schematic view of area A;

FIG. 11 is a schematic view of a paper container;

fig. 12 is a schematic view of a detected state of the paper container.

Reference numerals: an upper cylinder 1; an upper piston rod 10; a first throttle valve 11; a pilot-operated one-way speed control valve 12; a floating joint 13; a guide fixing plate 2; a position sensing bolt 20; a linear guide shaft 3; a low pressure air inlet 4; an intake joint 40; an outer seal cover 41; an inner seal cover 42; a cover gasket 43; a first bolt pad 44; a first through-hole bolt 45; a gas chamber 46; a cup mold 5; a cup mold base 50; a first air pipe joint 51; a linear bearing 52; a ring groove 53; a cup opening gasket 54; a cup opening ring 55; a bottom seal 6; a bottom seal 60; a bottom sealing plate 61; a second bolt pad 62; a second through hole bolt 63; a cylinder seal ring 64; a cylinder fixing plate 7; a lower cylinder 8; a lower piston rod 80; a second air pipe joint 81; a second throttle valve 82; a paper container 9; a container sidewall 90; a container bottom plate 91; a circular lip 92.

Detailed Description

The technical scheme of the utility model is further described in detail below with reference to the specific embodiments and the attached drawings:

it will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1 to 4, a leakage detecting device for a paper container 9 includes: the upper cylinder 1, be connected with the direction fixed plate below the upper cylinder 1, the fixed position induction bolt 20 that is provided with in side of direction fixed plate is provided with two linear guiding axle 3 above the direction fixed plate, and two linear guiding axle 3 are laid in side of upper cylinder 1 symmetrically, and direction fixed plate below is fixed with low pressure air and lets in piece 4.

Referring to fig. 5, the upper cylinder 1 includes an upper piston rod 10, and a floating joint 13 is fixedly connected between the upper piston rod 10 and the guide fixing plate.

Referring to fig. 6, an air inlet connector 40 is connected to the side of the low-pressure air inlet 4, the air inlet connector 40 can be connected with a low-pressure air compressor through a pipeline, an outer sealing cover 41 is fixed at the bottom of the low-pressure air inlet 4 downwards, an inner sealing cover 42 is fixed at the inner side of the outer sealing cover 41, a gap exists between the inner bottom surface of the outer sealing cover 41 and the outer top surface of the inner sealing cover 42, a sealing cover gasket 43 is arranged, a groove body is arranged at the axis of the outer sealing cover 41 and is provided with a first bolt pad 44, a first through hole bolt 45 is arranged in the first bolt pad 44 in a matched manner, an air chamber 46 is arranged at the axis of the low-pressure air inlet 4, the first through hole bolt 45 passes through the outer sealing cover 41 and the inner sealing cover 42 upwards to be communicated with the air chamber 46, and the air inlet connector 40 is communicated with the air chamber 46.

Referring to fig. 7-8, a cup mold 5 is arranged under the external sealing cover 41, a cup mold base 50 is fixed at the bottom of the cup mold 5, a bottom sealing piece 6 is slidably arranged above the cup mold base 50 in the cup mold 5, an air cylinder fixing plate 7 is fixed at the bottom of the cup mold base 50, a lower air cylinder 8 is fixed below the air cylinder fixing plate 7, a first air pipe joint 51 is connected to the side of the cup mold 5, a second air pipe joint 81 is connected to the lower part of the bottom of the lower air cylinder 8, and pressure sensors for detecting air pressure are connected to the first air pipe joint 51 and the second air pipe joint 81.

Referring to fig. 9, the lower cylinder 8 includes a lower piston rod 80, the lower piston rod 80 is hollow, a cup bottom sealing pad 60 is fixed above the bottom sealing member 6, a bottom sealing plate 61 is fixed above the cup mold base 50, the cup bottom sealing pad 60 and the bottom sealing member 6 are cooperatively connected with a second bolt pad 62 at the axis, the second bolt pad 62 is cooperatively provided with a second through hole bolt 63, the second through hole bolt 63 passes downward through the cup bottom sealing pad 60 and the lower end is located in the bottom sealing member 6, and the lower piston rod 80 passes through the cylinder fixing plate 7, the cup mold base 50 and the bottom sealing plate 61 and the top is cooperatively connected with the second through hole bolt 63.

The cup die base 50 is fixed with a linear bearing 52 at the axis, the inner ring of the linear bearing 52 is matched with a lower piston rod 80, the lower piston rod 80 can axially slide relative to the linear bearing 52, and a cylinder sealing ring 64 is matched between the cup die base 50 and the bottom sealing plate 61 and between the cup die base and the lower piston rod 80. The cylinder seal 64 ensures tightness of the lower piston rod 80 when it slides in the cup die base 50 and the bottom seal plate 61.

Referring to fig. 10-11, a paper container 9 for detection is placed in a cup mold 5, the paper container 9 comprises a container side wall 90, a container bottom plate 91 is fixed at the bottom of the container side wall 90, a round lip 92 is arranged at the outer edge of the upper end of the container side wall 90, an annular groove 53 is formed in the upper end face of the cup mold 5 downwards, a cup opening gasket 54 is fixed on the inner bottom face of the annular groove 53, and a cup opening circular ring 55 is fixed on the upper end face of the cup opening gasket 54.

Referring to fig. 12, when in use, firstly, the upper cylinder 1 is fixed, the paper container 9 to be detected is put into the cup mold 5, and is clamped on the cup rim ring 55 through the round lip 92, so that the installation of the paper container 9 to be detected in the cup mold 5 is completed, at the moment, the upper cylinder 1 is controlled to push the upper piston rod 10 downwards to push the guide fixing plate 2, the guide fixing plate 2 drives the linear guide shaft 3 to slide downwards relative to the upper cylinder 1, the linear guide shaft 3 axially guides the relative displacement of the upper cylinder 1, the relative rising verticality of the upper cylinder 1 is ensured, the guide fixing plate 2 simultaneously drives the low-pressure air inlet piece 4 to move downwards, the inner sealing cover 42 is contacted with and presses down the round lip 92, the cup rim gasket 54 is deformed through pressing down the cup rim ring 55 until the outer sealing cover 41 is abutted with the upper end face of the cup mold 5, at the moment, the inner side wall 90 of the container forms a closed inner cavity, the lower cylinder 8 is controlled to enable the lower piston rod 80 to push the bottom sealing member 6 upwards, the bottom sealing member 6 drives the cup bottom sealing gasket 60 to move upwards and axially until the cup bottom sealing gasket 60 is abutted against the bottom of the container side wall 90, at the moment, the outer side of the container side wall 90 and the cup mold 5 form a closed outer cavity, meanwhile, the container bottom plate 91 and the cup bottom sealing gasket 60 form a closed bottom cavity, the air chamber 46 is communicated with the inner cavity of the paper container 9 through a first through hole bolt 45, the first air pipe joint 51 is communicated with the outer cavity of the paper container 9 in the cup mold 5, the second air pipe joint 81 is communicated with the bottom cavity at the bottom of the paper container 9, the inner cavity at the inner side of the paper container 9, the outer cavity at the outer side and the bottom cavity at the bottom are all closed spaces and are not communicated with each other, the low-pressure air compressor connected with the air inlet joint 40 is started to output low-pressure air to the inner cavity, after the inner cavity is kept in a low-pressure environment for a plurality of seconds, the pressure sensor connected to the first air pipe joint 51 and the second air pipe joint 81 detects the pressure of the outer cavity and the bottom cavity, and compares the detected pressure value with a preset value, if the detected pressure value is lower than the preset value, the air circulation between the inner cavity and the outer cavity and between the detected pressure value and the bottom cavity is not shown, the paper container 9 is a qualified product without leakage, and if the detected pressure value is higher than the preset value, the air circulation between the inner cavity, the outer cavity and the bottom cavity is shown, and the paper container 9 is a defective product without leakage.

After the paper container 9 is detected, the upper cylinder 1 and the lower cylinder 8 are controlled successively, so that the upper piston rod 10 and the lower piston rod 80 are separated from the paper container 9 successively, and after the detected paper container 9 is taken out, the next paper container 9 is installed and subjected to leakage detection in the above manner.

Referring to fig. 2, the upper cylinder 1 is connected to a first throttle valve 11 at the upper end side, and the lower cylinder 8 is connected to a second throttle valve 82 at each of the upper end side and the lower end side. The first throttle valve 11 and the second throttle valve 82 can respectively regulate and control the pushing and sliding speeds of the upper piston rod 10 and the lower piston rod 80, so that proper compaction of the paper container 9 is realized, damage to qualified finished products caused by damage to the paper container 9 due to compression deformation caused by too high sliding speed is avoided, unnecessary loss caused by leakage detection process is reduced, abrasion caused by collision between the outer sealing cover 41 and the upper end of the cup mold 5 due to too high sliding speed is avoided, and detection results are influenced due to air leakage of a formed cavity.

The pilot-operated one-way speed control valve 12 is connected to the lower end side of the upper cylinder 1. The pilot type one-way speed control valve 12 is used for keeping the exhaust throttle and shrinkage of the upper cylinder 1, so that the upper cylinder 1 cannot be weightless and slide down due to self gravity or external interference when not working, and the impact damage of the low-pressure air inlet piece 4 and the cup mold 5 is caused, thereby being beneficial to reducing the damage of parts when accidents happen, preventing workers from being accidentally clamped and hurt, and guaranteeing the safety of the workers.

The arrangement of the floating joint 13 can enable the upper piston rod 10 to slide smoothly in the upper cylinder 1 in the axial direction and drive the guide fixing plate 2 at the bottom and the low-pressure air inlet piece 4 to lift, so that on one hand, the upper cylinder 1 and the linear guide shaft 3 are kept in parallel all the time, the service life reduction caused by movement interference is avoided, on the other hand, the low-pressure air inlet piece 4 is beneficial to vertically pressing the upper end of the paper container 9, deformation caused by uneven pressing of the paper container 9 due to shaking and inclination is avoided, and the rejection rate is reduced.

During the downward movement of the upper piston rod 10 pushing the guide fixing plate 2, the position sensing screw 20 detects the height position of the low-pressure air inlet piece 44 so as to control the lifting amplitude, and avoid the loss of the upper cylinder 1 and the cup mold 5 caused by the continuous downward movement of the upper piston rod 10.

The utility model introduces low-pressure gas into the inner cavity of the paper container 9, ensures the comprehensiveness of the leakage detection of the paper container 9 in a mode of detecting the outer cavity and the bottom cavity, is beneficial to efficiently and accurately removing unqualified products, ensures the quality of outgoing products, does not damage the paper container 9, does not cause waste of resources, and simultaneously avoids potential safety hazards of operators.

The bottom sealing piece 6 capable of moving up and down is beneficial to the device to adapt to paper containers 9 with different height sizes on one hand, the overall applicability of the device is improved, on the other hand, the paper containers 9 are prevented from being put into the rear and directly contacted with the bottom sealing piece 6, deformation is caused when the low-pressure air inlet piece 4 presses down the paper containers 9, the paper containers 9 are scrapped, so that economic loss is increased, a piston rod is communicated with a bottom sealing cavity through a second through hole bolt 63, pressure detection is carried out on the bottom cavity through a pressure sensor connected with a bottom second air pipe joint 81, and leakage detection of the bottom surface of the paper containers 9 is realized.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (10)

1. A paper container leak detection apparatus comprising: an upper air cylinder (1), a guide fixing plate (2) is connected below the upper air cylinder (1), a linear guide shaft (3) and a low-pressure air inlet piece (4) are respectively fixed above and below the guide fixing plate (2), a cup die (5) is arranged below the low-pressure air inlet piece (4) in a matched mode,

the method is characterized in that: the bottom of the cup die (5) is fixedly provided with a cup die base (50), the cup die (5) is internally provided with a bottom sealing piece (6), the bottom of the cup die base (50) is fixedly provided with an air cylinder fixing plate (7), a lower air cylinder (8) is fixed below the air cylinder fixing plate (7), the lower air cylinder (8) is connected with the bottom sealing piece (6), the cup die (5) is internally provided with a paper container (9), the guide fixing plate (2) is connected with a position sensing bolt (20),

the low-pressure air inlet piece (4) is laterally connected with an air inlet joint (40), a first air pipe joint (51) is laterally connected with the cup die (5), a second air pipe joint (81) is connected below the bottom of the lower air cylinder (8), and the first air pipe joint (51) and the second air pipe joint (81) are both connected with pressure sensors.

2. A paper container leak detection apparatus as defined in claim 1, wherein: the upper cylinder (1) is connected with a first throttle valve (11) at the upper end side, and the lower cylinder (8) is connected with a second throttle valve (82) at the upper end side and the lower end side respectively.

3. A paper container leak detection apparatus as defined in claim 1, wherein: the upper cylinder (1) is connected with a pilot-operated one-way speed control valve (12) at the side of the lower end.

4. A paper container leak detection apparatus as defined in claim 1, wherein: the lower cylinder (8) comprises a lower piston rod (80), the lower piston rod (80) is hollow, a cup bottom sealing gasket (60) is fixed above the bottom sealing piece (6), a bottom sealing plate (61) is fixed above the cup die base (50), the cup bottom sealing gasket (60) and the bottom sealing piece (6) are connected with a second bolt pad (62) together, the second bolt pad (62) is internally matched with a second through hole bolt (63), the tail end below the second through hole bolt (63) is positioned in the bottom sealing piece (6), and the lower piston rod (80) penetrates through the cylinder fixing plate (7) and the bottom sealing plate (61) and the top end of the lower piston rod is matched with the second through hole bolt (63).

5. A paper container leak detection apparatus as defined in claim 1, wherein: the upper cylinder (1) comprises an upper piston rod (10), and a floating joint (13) is connected between the upper piston rod (10) and the guide fixing plate (2).

6. A paper container leak detection apparatus as defined in claim 1, wherein: the low-pressure air inlet piece (4) is characterized in that an outer sealing cover (41) is fixed at the bottom of the low-pressure air inlet piece (4), an inner sealing cover (42) is fixed on the inner side of the outer sealing cover (41), a sealing cover gasket (43) is arranged between the outer sealing cover (41) and the inner sealing cover (42), a first bolt pad (44) is arranged in the outer sealing cover (41), a first through hole bolt (45) is arranged in the first bolt pad (44) in a matched mode, an air chamber (46) is arranged in the low-pressure air inlet piece (4), and the first through hole bolt (45) penetrates through the outer sealing cover (41) and the inner sealing cover (42) and is communicated with the air chamber (46) and the air inlet joint (40).

7. The paper container leakage detecting apparatus according to claim 4, wherein: the cup die base (50) is fixedly provided with a linear bearing (52) at the axis, the inner ring of the linear bearing (52) is matched with the lower piston rod (80), and the lower piston rod (80) can axially slide relative to the linear bearing (52).

8. A paper container leak detection apparatus as defined in claim 1, wherein: the paper container (9) comprises a container side wall (90), a container bottom plate (91) is fixed on the inner side of the bottom of the container side wall (90), and a round lip (92) is arranged at the outer edge of the upper end of the container side wall (90).

9. The paper container leak detection apparatus of claim 8, wherein: an annular groove (53) is formed in the upper end face of the cup die (5) downwards, a cup opening gasket (54) is fixed on the inner bottom face of the annular groove (53), and a cup opening circular ring (55) is fixed on the upper end face of the cup opening gasket (54).

10. The paper container leakage detecting apparatus according to claim 4, wherein: and an air cylinder sealing ring (64) is matched and arranged between the cup die base (50) and the bottom sealing plate (61) and the lower piston rod (80).

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